From da8afb7973871bbb53cfbcff7926659ea3e44b75 Mon Sep 17 00:00:00 2001
From: RoboticsYY <yu.yan@intel.com>
Date: Sun, 17 Nov 2019 19:11:43 +0800
Subject: [PATCH] Fix warnings: friend operators not declared within a
 namespace

---
 octovis/src/extern/QGLViewer/VRender/NVector3.h  | 3 +++
 octovis/src/extern/QGLViewer/VRender/Primitive.h | 2 ++
 octovis/src/extern/QGLViewer/VRender/Vector2.h   | 2 ++
 octovis/src/extern/QGLViewer/VRender/Vector3.h   | 3 +++
 4 files changed, 10 insertions(+)

diff --git a/octovis/src/extern/QGLViewer/VRender/NVector3.h b/octovis/src/extern/QGLViewer/VRender/NVector3.h
index cac62e47..59e2da24 100644
--- a/octovis/src/extern/QGLViewer/VRender/NVector3.h
+++ b/octovis/src/extern/QGLViewer/VRender/NVector3.h
@@ -115,6 +115,9 @@ namespace vrender
 
   }; // interface of NVector3
 
+  double operator*(const NVector3 &u,const Vector3  &v);
+  double operator*(const Vector3  &u,const NVector3 &v);
+
 }
 
 #endif // _NVECTOR3_H
diff --git a/octovis/src/extern/QGLViewer/VRender/Primitive.h b/octovis/src/extern/QGLViewer/VRender/Primitive.h
index 34d1f750..35ef8e54 100644
--- a/octovis/src/extern/QGLViewer/VRender/Primitive.h
+++ b/octovis/src/extern/QGLViewer/VRender/Primitive.h
@@ -66,6 +66,8 @@ namespace vrender
 	class Feedback3DColor ;
 	class Primitive ;
 
+	std::ostream& operator<<(std::ostream&,const Feedback3DColor&);
+
 #define EPS_SMOOTH_LINE_FACTOR 0.06  /* Lower for better smooth lines. */
 
 	//  A Feedback3DColor is a structure containing informations about a vertex projected into
diff --git a/octovis/src/extern/QGLViewer/VRender/Vector2.h b/octovis/src/extern/QGLViewer/VRender/Vector2.h
index 9414768e..33e26269 100644
--- a/octovis/src/extern/QGLViewer/VRender/Vector2.h
+++ b/octovis/src/extern/QGLViewer/VRender/Vector2.h
@@ -176,6 +176,8 @@ namespace vrender
 			double _xyz[2];  //!< The 3 vector components
 
 	}; // interface of Vector2
+
+	Vector2 operator- (const Vector2&);	
 }
 
 #endif // _VECTOR2_H
diff --git a/octovis/src/extern/QGLViewer/VRender/Vector3.h b/octovis/src/extern/QGLViewer/VRender/Vector3.h
index f6a58535..ddb14581 100644
--- a/octovis/src/extern/QGLViewer/VRender/Vector3.h
+++ b/octovis/src/extern/QGLViewer/VRender/Vector3.h
@@ -191,5 +191,8 @@ namespace vrender
 			double _xyz[3];  //!< The 3 vector components
 
 	}; // interface of Vector3
+
+	Vector3 operator* (double,const Vector3&);
+	std::ostream& operator<< (std::ostream&,const Vector3&);
 }
 #endif // _VECTOR3_H